Added free eBooks that I am aware of.

I had a blog post here:

http://www.gep13.co.uk/blog/free-ebooks/

which listed some free eBooks that I was aware of.  I have taken the programming related ones, and added them to this list.
Corrected links

Corrected the internal link to the Windows 8 section.
Corrected the external link to Windows Phone Blue Book
Détecter et résoudre les erreurs, extraits du LaTeX compagnion
remettre dans l'ordre
Add Html5, CSS and Javascript Book Blog Link
Merge pull request #285 from minsOne/master

Add Html5, CSS and Javascript Book Blog Link
Merge pull request #283 from gep13/master

Added free eBooks that I am aware of.
Merge pull request #284 from maieul/master

Annexe B du LaTeX Companion + remise en ordre alphabetique des titres